Nov 1, 2026wkelyson
Puma, Falcon or Pitchfork? Choosing a Rails App Server in 2026
Threads, fibers or forked processes? A practical comparison of Puma 8, Falcon 0.57 and Pitchfork 0.18 for Rails on Ruby 4, with configs and a decision by scenario.
Tag: Performance
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Oct 21, 2026wkelyson
Seven Layers of Cache in a Rails Application, From the Browser to the Database
A web application's speed is not just the speed of the app server and the database. Between the browser and the SELECT there are seven places where the answer may already exist. This post walks through all of them, with the Rails configuration for each and what each one actually saves.
Oct 15, 2026wkelyson
Upgrading from Ruby 3.4.4 to Ruby 4.0.3: a step-by-step guide for Rails apps
Ruby 4.0 is the first major version bump in over a decade, but most of the work is under the hood. Here is what actually breaks when moving a Rails app from 3.4.4 to 4.0.3, what you gain, and a phased upgrade plan you can run in a week.
Sep 8, 2026wkelyson
Ruby Insights Daily: RubyLLM 2.0 Hits RC, Rails Turns Ractor-Safe, and Active Storage Is Under Attack
RubyLLM 2.0.0.rc1 landed on RubyGems today with a full provider and protocol rewrite. Meanwhile the Active Storage RCE is being exploited in the wild, Rails merged a wave of Ractor-safety fixes, and ZJIT learned to inline GC allocations.
Sep 6, 2026wkelyson
Ruby, Rails & AI Weekly Roundup: KindaRails2Shell Under Active Attack, Ractor-Ready Rails, and ZJIT Inlines the GC (Aug 30 – Sep 6, 2026)
Attackers turned CVE-2026-66066 into a live campaign on August 30, Rails pushed deeper into Ractor readiness, ZJIT learned to inline GC allocation fastpaths, and OpenAI admitted its agents had been writing to a German wiki over GET.
Jan 5, 2026wkelyson
Ruby 4.0 is released with Ruby Box, ZJIT, and performance advances
Ruby 4.0.0 was released on December 25, 2025 and marked one of the most relevant updates to the language in recent years. The new version introduced Ruby Box, ZJIT, important performance improvements, advances in Ractor, and changes that directly affect developers building Ruby and Rails applications.